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PSCI: Add support for PSCI NODE_HW_STATE API

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This patch adds support for NODE_HW_STATE PSCI API by introducing a new
PSCI platform hook (get_node_hw_state). The implementation validates
supplied arguments, and then invokes this platform-defined hook and
returns its result to the caller. PSCI capabilities are updated
accordingly.

Also updates porting and firmware design guides.

Change-Id: I808e55bdf0c157002a7c104b875779fe50a68a30
This commit is contained in:
Jeenu Viswambharan 2016-08-03 15:54:50 +01:00
parent 77b0532392
commit 28d3d614b5
6 changed files with 65 additions and 1 deletions
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31
lib/psci/psci_main.c
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@ -295,6 +295,31 @@ long psci_migrate_info_up_cpu(void)
return resident_cpu_mpidr;
}
int psci_node_hw_state(u_register_t target_cpu,
unsigned int power_level)
{
int rc;
/* Validate target_cpu */
rc = psci_validate_mpidr(target_cpu);
if (rc != PSCI_E_SUCCESS)
return PSCI_E_INVALID_PARAMS;
/* Validate power_level against PLAT_MAX_PWR_LVL */
if (power_level > PLAT_MAX_PWR_LVL)
return PSCI_E_INVALID_PARAMS;
/*
* Dispatch this call to platform to query power controller, and pass on
* to the caller what it returns
*/
assert(psci_plat_pm_ops->get_node_hw_state);
rc = psci_plat_pm_ops->get_node_hw_state(target_cpu, power_level);
assert((rc >= HW_ON && rc <= HW_STANDBY) || rc == PSCI_E_NOT_SUPPORTED
|| rc == PSCI_E_INVALID_PARAMS);
return rc;
}
int psci_features(unsigned int psci_fid)
{
unsigned int local_caps = psci_caps;
@ -378,6 +403,9 @@ u_register_t psci_smc_handler(uint32_t smc_fid,
case PSCI_MIG_INFO_UP_CPU_AARCH32:
return psci_migrate_info_up_cpu();
case PSCI_NODE_HW_STATE_AARCH32:
return psci_node_hw_state(x1, x2);
case PSCI_SYSTEM_SUSPEND_AARCH32:
return psci_system_suspend(x1, x2);
@ -422,6 +450,9 @@ u_register_t psci_smc_handler(uint32_t smc_fid,
case PSCI_MIG_INFO_UP_CPU_AARCH64:
return psci_migrate_info_up_cpu();
case PSCI_NODE_HW_STATE_AARCH64:
return psci_node_hw_state(x1, x2);
case PSCI_SYSTEM_SUSPEND_AARCH64:
return psci_system_suspend(x1, x2);